Catalysis by Acids and Bases by B. Imelik PDF

By B. Imelik

ISBN-10: 0080960545

ISBN-13: 9780080960548

ISBN-10: 0444424490

ISBN-13: 9780444424495

Due to the nice significance of acid catalysis within the petrochemical undefined, wide examine has been performed over the last 30 years about the basic and utilized elements of catalysis by way of acids. by contrast, base-catalyzed reactions have obtained little awareness in heterogeneous catalysis. the purpose of this symposium was once to judge our wisdom of the real region of acid and base catalysis and to hide a huge variety of solids, zeolite chemistry being just one element of heterogeneous catalysis.

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When heated 2 hours a t 500°C t h e sample shows l i n e s o f KA102 and some o t h e r u n i d e n t i f i e d l i n e s . 4 A, which a r e t h e main l i n e s o f y o r q alumina. X-Ray diagram o f B20K ( f i g . 8 A. This seems t o be t h e s u p e r p o s i t i o n o f t h e diagrams o f alumina and o f heated KA1(C03)(0H)2(fig. 5, a, f ) . 8 A, t h e d i a - y a m looks l i k e a s u p e r p o s i t i o n o f alumina and o f t h e heated m i x t u r e KA1C0,(OH)2 pseudo-boehmite ( f i g .

Gorte, J . Catal. 75 ( 1 9 8 2 ) 164. 11 P. F o r z a t t i , M. Borghesi, I. Pasquon and E. Tronconi, Surface Sci. 137 (1984) 595. B. Imelik e t al. A. L E R C H E R , Ch. COLOMBIER, H. VINEK and H. NOLLER Technische Universitat Wien, I n s t i t u t f u r Physikalische Chemie, Getreidemarkt 9 , A-1060 Vienna, Austria ABSTRACT Acid and base strength of alumina magnesia mixed oxides was investigated by adsorption of various molecules. The change of the i . r . spectra of acetone, pyridine and carbon dioxide a f t e r adsorption was used t o estimate the strength of Lewis acid and base s i t e s which interacted w i t h the adsorbed molecules.

OH d e n s i t y a t i n c r e a s i n g K-content f o r samples evacuated 3 h a t 450 " C . The simultaneous o b s e r v a t i o n i n t h e OH-region shows t h a t t h e bands a t 3790 1 1 and 3770 cm- a r e t h e f i r s t t o disappear when p y r i d i n e p r e s s u r e i n c r e a s e s . 1 A t s t i l l h i g h e r p r e s s u r e t h e band a t 3730 cm-' s h i f t s t o 3720 cm- and t h e n 1 d i s a p p e a r s w h i l e t h e bands a t 3680 cm-l and 3590 cm- remain q u i t e u n a f f e c t e d .

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Catalysis by Acids and Bases by B. Imelik

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